Rotary field-magnet.



No. 890,982. PATENTED JUNE 16. 1908.

J. HISSINK. ROTARY FIELD MAGNET.

APPLICATION FILED KAY 1'7, 1906.

V I .dz'farney I 'Be' 'itkiio'wn'that I, ject of the. Queen-of the Netherlands, and re JACK n ssINK, or BERL N; GERMANY.

' ROTARY rinnn-maema'n Application filed 1'7 sidingat No..8,'HansaUfer,-Berlin, Germany;

. Thepresent invention relates *torotary in the forrnoia the copper is laid I right hand recesses-and finally'in the-last w must be .40

-- force between r l even;

, each'j. 01

i the cross sections towards the endsof the l l crease winding; is effected by combining" several jai-rs of recesses forv ne-. x e "forone 'poe rece'ptiorr to'the' ordinates of a sine curve and thereiore forcein I I I -I1'1O11S recesses of a pole '18. not the same. 35- 4 a The" present invention invented 1 certain" new and useful linpro'vements in which the following-isa full, clear, and enact description. field 'Inag'netsfor single and polyphase current generatorsand consists o; a' field magnet drinnand possessing no pole shoes. The" field windings of said'- 1nagnet are arrangedin'peripheral'recesses of equal depth .exten ing radiallyfinwards. The

instance surface, so th' three pairs to I tjthe winding Willfirst "inclose' the iron lying betweenthe central pair of recesses and then in the "adjacent left and pair of greces'ses, if the recesses for theof the ii'eld' winding were all of equal? cross section, the magnetic field, as will e. readily understood, would not correspond the ironat theend'sof the pole'swould notbe fully utilized, because the even distribution and equal cross'sections of the recesses would necessarily involve an'even distribution of the iron,- while the density of the lines of the iron i seginents between the va- I i The density of the lines of force in each-pole is rreatest in the iron between the central air trecessesaiid decreases towards'the end; of the poles. Therefore theiron "of the field chosen-sufficiently large to corre .spond to the greatest density the lines of the central recesses. of each otherwise; if theycross' .,scctions were not be. properlyutilized;

the pairs of recesses of each a r of recesses of llest cross section each pole having .The'increase in.

pole of unequal cross sections, thecenfpral havingthe 'srn'a and t side'r'ecesses of the greatest'i cross sect on.

a mannefas to cause pole is efiected'in such the magnetic .field 'to approximate a sine curve .as closely l asossible. Since, with this arran 'einent of, the cross sections of the -l recesses, t 1e mostfiron will lie between the l sneeificationvot Letters. Patent.

gnomy Field -.M agnets, of

i the rotormay I rotor being I I in accordance with their breadth, the re, polecenter, contain the iron at the ends of the poles would I consists in lnaking l l tion's or segments racemes" we 1c, 190s.

central pair ofrecesses and thecross' section of the iron parts or segments will decrease towards-the pole ends, a more c orn tion of the iron willbe attains ends, than would were. of faneven 'cross at the pole section throughout.

- Thus a saving in iron will be effected so that a be of a smaller d ameter;

which'is of great importancein connection with high speed'geneiators'.

In order to render'the present" specification easily intelligible referen'ceis had to tho accompanying drawing in which similaf'letters of reference denote siinilar parts in both -v1ews.

Figure '1 "field magnet of a two pole generator, and Fig. 2 shows a developed view of the rotor.

The rotor g is in the form of a drun may consist of solid or laminated iron; and radial recesses a, b, c} d, e, f are, rovided in its periphery, of equal radial depth and equi distant from each other, for the reception 0 the field windings. The poles of the rotor are indicated at N and S. Eachpole possesses sixrecess'esor three airs of'them, 0,1), Ic', d and e; f, respectively; the cross. sections of which aredi'fferent, the cross sections of the the smallest and those of the-recesses at the ole ends being greatest, estate 1. v Fig. 2 shows the arrangement of the'wmdmg, the

wound in the form of a drum.

cesses 01 5 nearest to the the least-copper, the next lying recesses. c, (1 contain about twice as much co per, while the recesses lying at the pole on s asat e j contain the most copper. .The copper isso distributed that the magnetic field will a roximate a sinccurve as nearly as possib e. .hat is to say, the turns on the rotor tion, with a corresponding density. Owing to the cross sections 0 the. several recesses the amount of meta-l left standing central pair of recesses 11 and b at It will be greatest, 'L. e. this'portion will have the great-. est cross section, the parts or. segments j,

towards the pole ends. Thegreatest densityot' the lines of force will be iii-the follows a sinc-law variavariation oi fluxbe the-case ifthe recesses and pair a, b lying closest to the pole center being between the poi it, while the density wil be lete utilize-1 is a section through therotary (listribution'of ampercdiflcrcncc in the considerably lcss in the metal left stai'iding Since at these points dial-depth, the consecutive recesses varying lows a sine-law variation; and that the iron I uniformly distributed recesses of uniform ral ing sections.

ing progressively in cross section from recess vantage ously utilized, than would be the case r 1f the recesses were all of equal cross section.

I claim:

l. A rotary less iron 1s present, the latter will be more adi l l poles to the pole ends.

5. A rotary field ma net Y rovided with refield magnet provided with oesses uniform as to radial epth but increasncreasing central portions of the poles to the pole ends the rate of increase being suchas to secure a I distribution of ampere-turns on the magnet I in accordance with a sine-law variation. uniformly distributed recesses of uniform ra- 6. .A rotary field magnet provided with radial depth to receive the windings, the cross dial recesses the joross section of which insection of said recesses varying in such a creases progressively, manner that the distribution of amperetions of the poles turns on the said magnet follows a sine-law variation. I dial recesses the 3. A rotary field .inagnet provided with creases progressively, from the central poruniformly distributed recesses'of uniform ra-' tions of the poles to the pole ends, the rate of increase being such as to secure a distribution of am ere-turns on themagnet in accordance with a sine-law variation.

In testimony whereof I .affix in the. presence of two witnesses.

JACK HISSINK.

rotary field to the pole ends.

in cross sectional area and the material be- I tween said recesses varying in thickness in I, such. a ,mannerthat the magnetic field fol- I at the endsvof the poles proirimately asfully will be utilized a as at the central po l Witnesses: I WoLnEMAn HAUPT, HENRY HASPER.

rovided with re- -4, A rotary field magnet epth butincreascesses uniform as to radial to recess from the central portions of theprogressively in crosssection, from the from the central por-' 7. A rotary field magnet provided with racross section of which in my signature 

